Be thankful it's your hair that's thick, not your brain. My hair used to be a thick thatch until I had that incident with a Browning 9mm and a policeman attempting to air-condition me. Then huge clumps started falling out.
So, if you're looking for a drastic cure ....

Long hair, do not wash often and wear a beautiful braid ?

I shave the lower half of the back of my head. Have been since my late teens. I still have very thick hair. Actually my hair is around 65 inches long, woven into 59 inch long Fairy Locks. I keep it all in a braid, which goes to my calves.

You could threaten it with my thinning hair genes, then it might behave

I have no advice, but I think you and your daughter have gorgeous hair!

My hair is super-thick, and super curly.
The best thing I ever did was cut it all off.
I do not miss having long hair. Especially in the summer.
When it's cold out, I wear a hat.

(sniff) I remember hair. . .

No idea...I wish I had thicker hair....mine is baby fine. You can get yours thinned, I can’t get mine made thicker. I would swap yours for mine any day!

I have no fucking idea!

I swear by It's a 10 products...it controls the waviness, sleeks the frizzies, and makes my ponytail easier to handle...I use the shampoo and spray on keratin...I also get razor cuts to manage the thickness or else it takes forever to dry...I am seriously thinking of cutting the length just to keep it manageable!

Good luck...it is a plus and a minus!

[amazon.com]

I had to learn to do braids for my daughter early on make three bunches wet and fold over. you have to be careful not to tie it too tight or she would get headaches Red heads feel more or are more sensitive to pain

I managed my thick hair by cutting it off. It was so thick a ponytail was both impossible and painful. I had to have dog ears if I got it off my neck.

You have beautiful. mine is thick and long, I recently cut it too much and it keeps falling out. I still find thick hair is easy and I wash it and tired it in a knot. It takes a long time to dry, but either a braid on one side with side part or to combs on each side keep it out of my eyes. I have friends whose hair has thinned. So I STFU and don't complain, it is more a blessing than a hassle.I llove your beautiful hair.

I got caught up in the expensive Wen products for a while. They packaged the Wen Sweet almond mint Replenishing Mist in one of the monthly boxes, and it is really nice, but it is expensive. Amazon's high rating is justified.

I these days I just put some castor oil on my hair if I want to tame the frizz, but it is pretty sticky and not easy to get good coverage for the mop I have. You can get it in a large size that last for ever. It will last three days if you don't wash the hair during that time.

I use Redken All Soft shampoo and conditioner in the shower, then use a leave in conditioner (ABBA has one that’s really good and Redken just came out with one that’s decent) as well as a smoothing heat protecting gel made by L’Anza, then I blow dry completely (this is important if you tend to frizziness), flat iron in layered sections (the more sections you separate your hair into, the better it will come out), and finally spritz with a strong hold hairspray around my face to keep it where I want it for a little while at least. Though it’s incredibly time consuming, the drying and flat ironing are really important to tame it and I have to use more product than most, but it works pretty well overall. I gave up on short hairstyles a long time ago. They take a heck of a lot more work. The products I mentioned are all available at Ulta.

You should get a tool called a vernier caliper. It's about 30 or so bucks at home depot or amazon. Get a good quality digital one.

With this tool you can accurately measure the actual thickness of your hair - and your family's and friends' hairs. I think this would be a fun project to see how the thickness of scalp hairs varies. I suspect not much. You can also measure along the length of the hair, or hairs from different parts of the body.

But one thing to consider is follicle density on a scalp. You just might have more follicles per square inch on your scalp than most people.

One thing to consider is looking at your hair under a microscope to see if there is a curl or twist in a single strand. A curly or twisty strand is more likely to repel water in bulk. Additionally there maybe oils coating the strand to prevent water wetting the hair. In order to easily wet you would have to strip the oils and queeze water into the strands or seperate the strands to get water in. Once between the strands, water will wet strongly into the keratin proteins of the hair. Since both water and kerstin are polar (semi-charged) molecules.
The water literally gets absorbed into the hair strand.

One experiment to conduct is to take a strand, oil it, check how water wets it. Then get some acetone, dip and wipe the strsnd with it to remove the oil. Test how the hair wets water. Does it absorb the water; or repel it?

Not sure what to suggest to manage long hair. I used to keep long curly dense hair, and my stylist offered to thin it shears so the hair has breathing room. Not sure if it helped. But I usually use gel or hair spray to lock it in place, usually placing a towel on top on my head to absorb water and force my hair into a shape resembling my skull. After its relatively dry it usually stays in place even in high winds.

Anyways, food for thought!

It sounds like a problem the way you describe it, but to me all photos show a beautiful hair, then,
Beauty is inherited!...

Even when I had a full head of hair, thickness was never my problem. As a teen, I used Brylcreem (A little dab’ll do ya) to perfect my pompadour

Hon, I got nothin' but love fa ya, and I would love to find myself on the other side of a dinner table from you, or on a hike with you! But complaining about having thick hair is like complaining about being rich! I'm just sayin'! That is not a problem! You said it yourself, it can be thinned! Hopefully one day I can see your beautiful locks personally! Just keeping it real!

Flat irons are the only thing my hair understands.

I am of Irish descent as well but my hair comes primarily from my roots in Africa. I have dreadlocks now, which makes managing much easier. Before that water and leave in conditioner were my best friends. Water was essential for combing and styling. No way I could do either without it. A good leave in conditioner makes it more manageable and less frizzy. I prefer home made over off the shelf by far. Oils tend to make my hair heavy and a bit unmanageable unless it's really light. Ive had good results with coconut and jojoba. Less is better IMO

I don’t But when given the opportunity …I mess it up

Enjoy while you can thins out with age

Be a baldie !